ZCW-MacroLabs-OOP-ScientificCalculator/Calculator.java

import java.util.*;

/**
 * Write a description of class Calculator here.
 *
 * @author (your name)
 * @version (a version number or a date)
 */

class Calculator{

    public static void main(String args[]){

        String toDo;                //what the user wants to do
        double num1 = 0;                //The user's first input
        double num2 = 0;            //The user's second input
        double result = 0;          //The user's answer
        boolean off = false;        //The user typed quit, becomes true
        double memory;
        boolean error = false;
        MathMethods calc = new MathMethods();

        while (off == false){
            Scanner input1 = new Scanner(System.in);
            System.out.println("What do you want to do?");
            toDo = input1.next();

            if (toDo.equalsIgnoreCase("quit")){
                off = true;
                System.out.println("Goodbye!!");

            } else if(toDo.equalsIgnoreCase("memory")){
                System.out.println("Read, Change or Clear?");
                String mem = input1.next();
                switch(mem) {
                    case "Read" :
                    result = Memory.memRead();
                    Memory.printAns(String.valueOf(result));
                    break;
                    
                    case "Change" :
                    System.out.println("Enter number:");
                    num1 = input1.nextDouble();
                    result = Memory.memUpdate(num1);
                    Memory.printAns(String.valueOf(result));
                    break;
                    
                    case "Clear" :
                    result = Memory.memClear();
                    Memory.printAns(String.valueOf(result));
                    break;
                    
                }
            }
        
            
            else {

            //System.out.println("toDO is: " + toDo);

            System.out.println(toDo + " -- Enter first number:");
            num1 = input1.nextDouble();
            //System.out.println("num1 is: " + num1);

            switch (toDo){
                case "add":
                case "subtract":
                case "multiply":
                case "divide":
                case "exponent":
                System.out.println(toDo + " -- Enter second number:");
                num2 = input1.nextDouble();
                //System.out.println("num2 is: " + num2);

            }

            switch (toDo) {        
                case "add":
                result = calc.add(num1, num2);
                memory = result;
                calc.printAns(String.valueOf(result));
                break;

                case "subtract":
                result = calc.subtract(num1, num2);
                memory = result;
                calc.printAns(String.valueOf(result));
                break;

                case "multiply":
                result = calc.multiply(num1, num2);
                memory = result;
                calc.printAns(String.valueOf(result));
                break;

                case "divide":
                result = calc.divide(num1, num2);
                memory = result;
                calc.printAns(String.valueOf(result));
                break;

                case "exponent":
                result = calc.exponent(num1, num2);
                memory = result;
                calc.printAns(String.valueOf(result));
                break;

                case "cosine":
                result = calc.cosine(num1);
                memory = result;
                calc.printAns(String.valueOf(result));
                break;

                case "inverse cosine":
                result = calc.invCosine(num1);
                memory = result;
                calc.printAns(String.valueOf(result));
                break;

                case "square root":
                result = calc.squareRoot(num1);
                memory = result;
                calc.printAns(String.valueOf(result));
                break;

                case "invert":
                result = calc.invert(num1);
                memory = result;
                calc.printAns(String.valueOf(result));
                break;

                case "sine":
                result = calc.sin(num1);
                memory = result;
                calc.printAns(String.valueOf(result));
                break;

                case "inverse sine":
                result = calc.iSin(num1);
                memory = result;
                calc.printAns(String.valueOf(result));
                break;

                case "degree to radian":
                result = calc.degToRad(num1);
                memory = result;
                calc.printAns(String.valueOf(result));
                break;

                case "radian to degree":
                result = calc.radToDeg(num1);
                memory = result;
                calc.printAns(String.valueOf(result));
                break;

                case "square":
                result = calc.square(num1);
                memory = result;
                calc.printAns(String.valueOf(result));
                break;

                case "inverse":
                result = calc.inverse(num1);
                memory = result;
                calc.printAns(String.valueOf(result));
                break;

                case "tangent":
                result = calc.tangent(num1);
                memory = result;
                calc.printAns(String.valueOf(result));
                break;

                case "inverse tangent":
                result = calc.iTan(num1);
                memory = result;
                calc.printAns(String.valueOf(result));
                break; 

            }
        }
    }
}
}

// /**
// * Created by leon on 2/9/18.
// */
// public class Console {
// Calculator calc = new Calculator();

// public static void print(String output, Object... args) {
// System.out.printf(output, args);
// }

// public static void println(String output, Object... args) {
// print(output + "\n", args);
// }

// public static String getMethod() {
// Scanner scanner = new Scanner(System.in);
// String userInput = scanner.nextLine();
// return userInput;
// }

// public static String switchStatment() {
// Scanner scanner = new Scanner(System.in);
// String ultimateAnswer = "";
// Boolean turnOff = false;

// switch (getMethod()) {
// case "add" :
// System.out.println("Enter your numbers:");
// double userInput = scanner.nextDouble();
// double nextInput = scanner.nextDouble();

// double answer = Calculator.add(userInput, nextInput);
// ultimateAnswer = Double.toString(answer);
// return Double.toString(answer);

// case "subtract" :
// System.out.println("Enter your numbers:");
// userInput = scanner.nextDouble();
// nextInput = scanner.nextDouble();

// answer = Calculator.subtract(userInput, nextInput);
// ultimateAnswer = Double.toString(answer);
// return ultimateAnswer;

// case "multiply" :
// System.out.println("Enter your numbers:");
// userInput = scanner.nextDouble();
// nextInput = scanner.nextDouble();

// answer = Calculator.multiply(userInput, nextInput);
// ultimateAnswer = Double.toString(answer);
// return ultimateAnswer;

// case "divide" :
// System.out.println("Enter your numbers:");
// userInput = scanner.nextDouble();
// nextInput = scanner.nextDouble();

// answer = Calculator.divide(userInput, nextInput);
// ultimateAnswer = Double.toString(answer);
// return ultimateAnswer;

// case "Square Root" :

// }
// return ultimateAnswer;
// }

// /*public static String getStringInput(String prompt) {
// Scanner scanner = new Scanner(System.in);
// println(prompt);
// String userInput = scanner.nextLine();
// return userInput;
// }

// public static Integer getIntegerInput(String prompt) {
// Scanner scanner = new Scanner(System.in);
// println(prompt);
// int userInput = scanner.nextInt();
// return null;
// }

// public static Double getDoubleInput(String prompt) {
// Scanner scanner = new Scanner(System.in);
// println(prompt);
// double userInput = scanner.nextDouble();
// double nextInput = scanner.nextDouble();
// double answer = Calculator.add(userInput, nextInput);
// return answer;
// }*/

// }